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Just hours before Stephen Paddock fired hundreds of rounds into a crowd from a 32nd floor hotel room, the group played a set at the Route 91 Harvest festival. Later, some members of the band's crew, Keeter said, were close enough to receive shrapnel wounds as 59 people were killed and more than 500 were injured.

Keeter said crew members have concealed handgun licenses, but "they were useless" in Las Vegas.

"We couldn't touch them for fear police might think that we were part of the massacre and shoot us," he said. "A small group (or one man) laid waste to a city with dedicated, fearless police officers desperately trying to help, because of access to an insane amount of firepower."

His tweet has more than 53,000 retweets and 102,000 likes as of Tuesday morning.